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Finding the Fourth Proportional to 330.14, 455.20 and 247.11

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Solution

The fourth proportional to 330.14, 455.20 and 247.11 is: 340.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.14 : 455.20 = 247.11 : x
  2. Step 2: Convert to fraction form
    330.14/455.20 = 247.11/x
  3. Step 3: Cross multiply
    330.14x = 455.20 × 247.11
  4. Step 4: Simplify right side
    330.14x = 112,484.47
  5. Step 5: Solve for x
    x = 112,484.47/330.14
  6. Step 6: Final answer
    x = 340.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.